Today's yoga challenge is Abs with Roll which is the modified version of the Vertical Legs Crunch which works your abdominal muscles to strength your core. The roll between the legs helps to engage your core and keep your legs steady.
The core consists of all the muscles in your abdominal and lower back areas. This includes all the abdominal muscles (rectus abdominus, internal and external obliques, transverse abdominus and intercostals) as well as the muscles associated with the spine (the erector spinae group) and the hip flexors (iliacus and psoas, collectively known as the iliopsoas.
A strong, stable core can help to prevent injuries because with stronger muscles supporting the spine, pelvis, and shoulder joints it can better handle the forces of rotation and compression that lead to back and joint injuries.
Watch the video at Yoga Bear website on to do the abs with roll workout.